I got a reply from Delta:
"Dear Mr Wise,
Thank you for contacting us.
Thank you for your continued interest in our Delta products. The color for the unit that you have was called the Antique Brass. This color has been discontinued. The closest finish that would match the unit would be something like a champagne bronze or perhaps polish brass. Unfortunately, we no longer manufacture this finish. I apologize for the inconvenience.
Please contact us back if you have any questions or need further assistance.
Consumer Response Representative"